One word substitution. single words with powerful meaning.

1. A speech made at the beginning of a play -  Prologue
2. A  record of  one's  life  written  by  somebody  else - Biography
3. A record of  one's life  written   by himself - autobiography
4. A knife fixed at end of a gun- bayonet
5. A woman whose husband is dead - widower 
6. A man whose wife is dead - Widower
7. A hater  of women- misogynist
8. A woman who has more than one husband at a time -  Polyandrist
9. The act of spying - Espionage
10. Smuggling goods - Contraband
11. Soldiers on foot- Infantry
12. Soldiers on horse - Cavalry
13. An instrument for measuring electric  current - Ammeter
14. A book containing  information an all branches of knowledge - Encyclopedia
15. Violating religious things - Sacrilege
16. A ceremony where a person becomes a priest - Oridnation
17. The right of self  government - Anarchy
18. A government run by the people - Democracy
19. A government by the rich - Aristocracy
20. A government by the mobs - Mobocracy
21. A  government  run by the bureaucrats - Bureaucracy
22.  A  government by a few - Oligarchy
23. The study of beautiful  handwriting - Calligraphy
24. The study of  derivation of words - Etymology
25. The  study of  insects- Entomology